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The sound of an alarm clock in the early morning hours can be one of the most disheartening noises ever made, but we are grateful to get to work on time and keep our jobs. This necessary, yet irritating, system works effectively for most people, but how does a deaf person get woken up? Glad you asked, and fortunately, in the high-tech world we live in, there are a number of options for the hearing impaired to be jolted out of restful sleep – just like the rest of us.

From the dawn of time, man and animal alike have had to wake up. Scientists have never been able to agree why we sleep, but no one can argue that it is absolutely necessary, and because of this, man has toiled for centuries with different methods of startling himself awake.

It's a little bit like stepping into the future, when you awaken to a projection alarm clock. The time dances magically on the bedroom wall, and the foot tall writing is easy to read.

Clocks, considered to be one of man's earliest inventions, originated 5,000-6,000 years ago. The ancient Egyptians used obelisks as primitive sundials; the shadow cast by the sun allowed them to split the day into two parts. Markings were later added to the bases of these structures, indicating further time divisions. But mankind still needed a means of keeping time that did not rely on sunny days.